Abstract
The line-to-continuum intensity ratio for the center of the Na D2 absorption line in a spot of area 20 × 10−6 in the Rome Group 5847 was found to be 0.033±0.05 on 6–7/7/70 by two methods.
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Goethe Link Publication No. 139. This work was supported by the National Science Foundation and the National Aeronautics and Space Administration.
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Fay, T., Remo, J. & Czaja, K. On the minimum intensity of the Na D2-5890 Å line in sunspot umbra. Sol Phys 26, 87–89 (1972). https://doi.org/10.1007/BF00155108
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DOI: https://doi.org/10.1007/BF00155108